Installing white roofs, green roofs, cool roofs, or photovoltaic systems are some of the ways to reduce the toll on our environment. They can all be effective means to improve your roof’s environmental performance, although some are more effective than others are in comparison. Below is a quick look at the different types of roofing systems in the US.
Cool roofs are one that uses a highly reflective material, irrespective of its color. A cool roof reduces the percent of sunlight transferred to heat by the surface of a building. In other words, instead of absorbing heat, cool roofing systems reflect sunlight.
Cool colored roofs are usually treated with a particular coating that makes the roof surface reflective. If several buildings in an area go for cool roof installation, it can reduce the gradual accumulation of heat in a location. In fact, if all major cities in the world use such a roofing system, the entire planet could be at the receiving end of all its benefits.
White roofs are another type cool roofing systems. Since they have a higher reflectivity, white colored roofs are a better choice in general than cool colored materials. Colored metal roofs or those with a metallic coating will absorb plenty of heat, thus they are not considered for cool roof installation.
Green roofs, on the other hand, are vegetation systems situated on rooftops of buildings. Their advantages comprise cooling a building through insulation and shading, minimizing peak storm runoff, aside from the main purpose. However, green roofs do not offer enhanced reflectivity, and therefore would only have a negligible impact on worldwide temperature if they were widely used.
Solar photovoltaic installation offers neither a cool roof’s reflectivity advantages nor a green roof’s storm water management benefits. Yet again, they can generate pristine energy, which is an important advantage especially in a bid to transform the planet with low carbon footprint. Since PV installations usually do not require the full surface of a roof, and at times they necessitate highly reflective materials to make sure adequate system energy, PV and cool roofing systems can complement each other.
To conclude, PV installations, green roofs, and cool roof systems have equal roles to play when it comes to making a building environmentally friendly. So it is best to do an evaluation on a case-by-case basis to know which roofing system or which combination is the most suitable for your home.